Abstract

Cognitive radios (CR) are the main technology for dynamic spectrum access, which makes it possible for unlicensed users to opportunistically utilize temporarily free licensed spectrum, when the licensed users are not using them. However, they should vacate the channel on the reappearance of the primary user and continue their communication on another channel, this functionality, known as spectrum mobility, ensures that primary users communication does not get interrupted because of the secondary users and that secondary user maintain a good quality of service. A cognitive radio network is made up of primary and secondary users, coexisting together and vying to make use of the spectrum. Therefore a dynamic spectrum sharing method needs to be devised to ensure fair spectrum sharing amongst both the primary and secondary users. Presented in this paper are algorithmic approaches and implementations on using intelligent mobile agents for spectrum sharing and spectrum mobility in a cognitive radio network.

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